Bronze Gate Valves are used in commercial and residential general service applications. They feature bronze body construction with female threaded connections, Brass non-rising stem, and gland, PTFE packing, bronze threaded bonnet, solid wedge disc, and Brass Lock Nut. By the term "lockshield" it is meant that once the adjustments are done, the valve is shielded with the plastic cap which prevents it from being changed accidentally. When the caps are removed, the top of a spindle is revealed that traditionally comprises of two straight sides at the top for taking an open-ended or adjustable spanner.
On some older versions of the radiators, they have a square or half-moon shape. The spindle is turned with the spanner for adjusting the flow of water through the radiator. Adjustment is required for the lockshield valve while ‘balancing’ radiators in several rooms. In cases when a radiator is taking very long to warm up, it needs more hot water flowing through it. This actually means that the lockshield valve must be opened for allowing the radiator to fill faster. in cases when a radiator gets heated faster than others then the flow through it requires to be restricted. The valve should be tightened to this for reducing the flow of water.